Marine Duct Wrap

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Marine Insulation - Ductwrap

Marine Duct Wrap Insulation is used to insulate rectangular and round HVAC ductwork for marine and general applications. It reduces unwanted heat loss or gain from equipment and ductwork and, when properly installed in the correct thickness, virtually eliminates condensation problems on cold duct surfaces.

  • More efficient operation of heating and cooling equipment
  • Prevention of moisture issues caused by condensation
  • Available unfaced or with FSK vapor retarder facing
  • Faced products have stapling/taping tab on one edge

These insulation products may qualify for rebates and other incentives. For more information, visit for your area’s specific offers.

CertainTeed cares about the environment and Building Responsibly™, and for more than 100 years has maintained a commitment to provide sustainable, innovative solutions that improve energy efficiency and comfort. From production to product, CertainTeed's focus has been on minimizing its impact on the environment by reducing energy consumption, conserving renewable resources and lowering greenhouse gas emissions. And with our Sustainable Insulation® fiber glass products, the mission continues. Visit for more information or watch our YouTube video.


Model Building Codes:
  • ICC Material Standards
  • ASTM C1290
  • ASTM C553, Type I -- Type 75 Duct Wrap
  • ASTM C553, Type II -- Type 100 and 150 Duct Wrap
  • ASTM C553, Type III -- Type 150 Duct Wrap
  • CAN/CGSB-51.11-92 
  • ASTM 1136 -- FSK and Type II Certifications: USCG 164.109/58/0 and 164.112/122/0

Fire Resistance: Fire Safety Standards
  • NFPA 90A •NFPA 90B Fire Hazard Classification 
  • Ul 723, ASTM E84, NFPA 255, CAN/ULC-S102-M88 
  • Max. Flame Spread Index: 25  
  • Max. Smoke Developed Index: 50 Noncombustibility
  • ASTM E136, Meets requirements Physical/Chemical Properties

Thermal Performance:

See Marine Duct Wrap specification sheet (30-35-015) Operating Limits (Temperature)
  • ASTM C411, Faced -- Max. 250ºF (121ºC)
  • ASTM C411, Unfaced -- Max. 450ºF (232ºC) Water Vapor Sorption
  • ASTM C1104, < 5% by weight Water Vapor Transmission (Facing)
  • Max. 0.02 perms (1.15 x 10-9 g/Pa-s-m2) (ASTM E96, Desiccant Method)

  • ASTM C665, Passes test requirements Fungi Resistance
  • ASTM C1338, Passes test requirements Odor Emission
  • ASTM C1304, Passes test requirements

Sheet metal ducts shall be clean, dry and sealed tightly prior to insulating with CertainTeed Marine Duct Wrap. To ensure installed thermal performance, CertainTeed Marine Duct Wrap shall be cut to "stretch-out" dimensions. This requires measurement of the duct perimeter, then cutting the duct wrap to the dimensions (perimeter + add-on) indicated in the stretch-out table on the Marine Duct Wrap Insulation specification sheet (30-35-015). A 2" piece of insulation is removed from the facing at the end of the piece of insulation to form an overlapping stapling and taping flap. CertainTeed Marine Duct Wrap is installed by wrapping the insulation around the perimeter of the duct with the facing out. Adjacent sections of duct wrap are tightly butted with the 2" taping flap overlapping. Seams shall be stapled with outward-clinching staples on approximately 6" centers. Where a vapor retarder is required, all seams, joints, tears, punctures and/or other penetrations of the duct wrap shall be sealed with a pressure-sensitive vapor retarder tape that matches the facing, or a suitable mastic system. Where rectangular ducts are 24" in width or greater, CertainTeed Marine Duct Wrap shall be additionally secured to the bottom of the duct with mechanical fasteners spaced 18" on center to prevent sagging. For additional installation details, consult the National Commercial and Industrial Insulation Standards (current edition) published by the Midwest Insulation Contractors Association (MICA).

CertainTeed recommends that all installations be approved and certified by the local approval bodies. Approved assemblies for specific fire rating are available upon request.

Refer to CertainTeed's Limited One-Year Warranty for Fiber Glass Duct Wraps (30-29-047).
CertainTeed insulation products improve building and marine energy efficiency and reduce energy consumption for the life of the structure or ship. As a result, they help conserve nonrenewable energy sources, decrease dependence on foreign oil and lower greenhouse gas emissions. In addition, the recycled content of CertainTeed fiber glass insulation meets the EPA Recovered Material Guideline for fiber glass products, 20-25% consisting of pre-consumer and post-consumer glass cullet.